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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '024c9bfdfc8fb5207382838e810a41428186ed5e79bc0f57c768774602f72294' 
  AND token = 'xHoLZpYc4CwZTJ4zycKMJ+6yupn4Nm34xScp+7nrzTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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