Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c1ef14ef4824ce4d725fa2216ce581493e464ad7057486c1bebba81ea990bee' 
  AND token = 'crHVP3q7eKGzinZnc38t/couz5RvbSSWlazhtcTsMWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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