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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9920d523422d3315d4aa67c08817379da43e2b5345ddb1ae2d6b28498502761f' 
  AND token = 'gpqRYaV3qwsLP9oEmx5zR9pIEGWFR87ew02aV/siydg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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