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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ecfb7e4ae137c5d9f800d37ef59ae6c058a60ce74948bcc07ddabcfcb7f51b4' 
  AND token = '4S+tsCZaJ/k43uB60d6AIn9ehvsTMxKAfRGjhLqNnvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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