SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd896f854f7002c25c8b110605897f51011910468057f096e4a6862c31375a9c0' 
  AND token = 'sLAM7wDnpy6nOIFhmdviR/yO+rhkiIVPVkWxNJpAO4c=' 
  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