SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07386bfa52876fc893dbf7d18f9493bdc7af945284dd7fff129fe2fe3dd854ab' 
  AND token = 'oB+xZhoniNe+rmLoKtUjDy3uGAK76Z4YSnIf/GwdwsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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