SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e013d249a327111b6b8ee9cf04a5895d53e343c1a76618de83d4b28b1d1a674' 
  AND token = 'R7B+Xiig0uSj8qcLJ0HTgGhmrOLy41OoDgn16rVtHAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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