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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3ece7bda696c8595c17f63811430e465c6635e888e21e70581171527845ccd' 
  AND token = 'J9XNj4W13wf4+IYEejxzGV4F3fbPYpQdGa3B3LVvBqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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