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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b63d126336bf7b6e6f1caa7122eb4ed341a12fb911bd436d4cbaba7a33b526d8' 
  AND token = 'pHFnNWlbPknHfF/3Kk2ez1zHT48vhgIhxBvXWoCJhy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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