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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d6d342cf7fa492f0b0092f7890033247bb95adfb761deacab40c971c43ed61f' 
  AND token = '9wQfDIz/qNqIDNbMawWsJB6F6Zn7f9dp7w1jBCeVvRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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