SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6b118ce8089cc20151ab0c734e7b31108bce67af2513f8d53f6570a530ae985' 
  AND token = 'wR9b7y5Dducx9uUnz+4W2UPOmxXCdXXlzuB1BI4bx5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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