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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e77512c2f7db6dbe4f701df37fa43ec9f7803335971b27bc440ded5c68c66bc' 
  AND token = 'o6iBc605L7Q09NeTCHu8RtCMzpyWO8HMo0DNNGfeom0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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