SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9426fdfd0bae36a84a491b00439dd82acf439ddfe1da07cb6089751068bf6125' 
  AND token = 'zTsIsHD0x/Vq2wLs5HMY42d6SUo7/XzxF17jaTqL7Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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