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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2909bc5ae213a4e07623e6a7af49bb59d3dea69abfbaa50fa3bba8228e774f6' 
  AND token = 'v7jRxopxF02lD8IlmCqhxEbmbJmVncdIp7eLDrcIQMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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