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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0008c61d8e83a101a88f2a24c9718388dfaf426ecdccb2483cb7d69051983fbb' 
  AND token = 'd7auP9Z9lWxx5NfjP5MZvt8SuiIYagZ71dx2QN4ifQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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