SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e4eaec13b7b01948a407b0ea4018c0dda0471c3e9197b7120ce3f4676660639' 
  AND token = '6Deq2Y2rmG/KhvAJNGXwsZ+KHDzr+/S+t6w9SEG0edg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

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