SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb88e17d0a49bd3988fc07d911908c3c9b14b2c13bea5d02894d9bf96ba86ef9' 
  AND token = 'BfpgQdl5OnDKCY4YVyZXGu/4+t3go5E0Y2hvEWIDgyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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