SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5014c7e6ab92f84ecbf45151f6b7b2b1ebdc4755c9309601f1c7d5e5f90afe68' 
  AND token = 'AfsYifB0aWDdgvA2DaAz0Hv+EARkjtOQFeouRLYfKMI=' 
  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