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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6246b524ae7890755c0f8ce2882db0fef2363b2f918967eef22aa40c02ffd1db' 
  AND token = 'Tg6/+LcJNm9IhccKHTzKnjKNSVWOealQ4eRc7l/v3Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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