SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f40dd0c3951ac47583f85d3c1ffd53b230d7bea0bc4f529086f69a5d53251f4' 
  AND token = 'Heq8HTUYKJ/VifvWrxEOvOngtE8QzmVX8r4o/qu59Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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