SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b3ea27129207049feecae10d98d205810d833576e3f0aaef02d6e79a3eb04d' 
  AND token = 'ixxPqraFe2slONbjJemKCxwsOG+t8YVJe1oO0C7khfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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