SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e407da9c754867de548528428279250eb6a0bea2f7fd3bff404f61f07135996' 
  AND token = 'uLSqV6EX7fl+5+VFcMo3uIUqmlQN8Omi7bjrzLBBG7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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