SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48c284faedf839b3955e79000fbb9f5fbea7a9f485c73d2aea41c6633514ce5b' 
  AND token = 'p27v9zq2p4rc5bC01tXTv2BbLjfiopu/Td54UYZQGBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

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