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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaf4fa0bcc0f174303ce767e4d52f98dd49d7b3ed9d87026c3b46a5035d652bb' 
  AND token = 'tvESD9cahsTtvTWkp5YYRIJwxQeodvbpHy55JlPN8f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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