SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '553ada65823c4599a6f11b941d9a74bde939ae4a6dca340ff1f5dff57b5ab8e0' 
  AND token = 'xe/gXOl4wYUCaq3M/YDNZ96dEzGFrlLusbYoYTUlA24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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