SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0084088476bf9fe93a75cd92ef3347690c80c294c1f81c94982b6fbd67baea36' 
  AND token = 'Ap301400Ch+yDZL5J+jqISMpCgJ7M6DUlohtnVKfclY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables