SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ce8878d97da5b700db79f7c6abf931524b3edd64a10c6509ed41d6789a75b1b' 
  AND token = 'JYF29b3rPhJ3FwffDTMU0VZZdZiEnOsgKgzbk3GIsGg=' 
  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