SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57692baf32c026db0929db3298649922c9481b8e8f39006124e35f81be7353c4' 
  AND token = 'vnlntsmc8SAoDHUEQNEA2wqXcdemDOdaZZK/EEoplos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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