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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c07ffdf220791e011f10e05180c40331a902c7a869dfdf0c3730d4526d2b5164' 
  AND token = 'VZfyGclds4RmWYNk81jPKY2L1O+fPb+b7G8Yp+dYBWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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