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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3343e89602292adc41ccb4488b7265063f2480a2904b30aa3d87127f3c54c4b7' 
  AND token = '3Sq5z0427QapcB3U4T4fECL9nllArAK8Lah2GypiUSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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