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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb1741adac794b584b2fc6611edf402b1bda511d4da9c8559e618749e5d9744' 
  AND token = 'jWdpc9eF6DQOdVVVS5v8sUwVZxna7ecJ0JebHjw/MBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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