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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd43e06e3cb8f5a038d5c72cdc851d4ead75417893c1df4bac3ce5cbf12b269ae' 
  AND token = '0+RgAauz1tLkXQEb613dhfypD5zGbSpMG3V4G/1Xg4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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