SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '452942c5874b83e8df82cdc933aa452eb9f75076f032b806f963d43ec3e14a3e' 
  AND token = 'WHxOx+YyXcOepRzmu09FLWiVeHRWrZGG/mZvpoP8Jls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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