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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b365927da1ba44011f04235f1065a959b2cdd11b0e87629be372f5a889ef3a9' 
  AND token = 'VRd9JLzFdQoH0bDEI+sd4pN/8U+AGSncdcepdxIuzKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}