SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d3d9556d46f30bad4bf02e4215e7dcde33f41cc761e84e8c6850af7687c1ab0' 
  AND token = 'Mq40rkR3h/r6a+i2S2YN+XK3ozoLsxAclGOYQh6Tcfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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