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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc39770280903e8db3acc5730d17ebc462ef3f95a3d0cf4c88483a3967c2b9a8' 
  AND token = 'ilvegGtZf/VM996UP10gqKxehrCMOWfq26RZGqHcst4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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