SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34953ef14d231350e598d02915fb846f481c6bc7f6b8c5426577eac0d0c7f799' 
  AND token = 'LsXkhMh0h3HJaYu/hjcvrOrsmh2VZNL7BJs1FPozKC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

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