SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd89e4efd7985c215dcbcda70515e5eb59a4f05d82afcaed4c5fefeb9d196cc68' 
  AND token = 'GRERRTI3S+LR2VPKkpBqx7NjZ3l+z64TwHis72WAgE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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