SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa2ed58836c5437200f37e4ba8e78141db8d1d92076d733eba8d90fc67311378' 
  AND token = 'mmCcMOHJVv7pvzYumiBo+VnGsGww3JZ/l/GskEI9png=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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