SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b2d71364bc51727a73dc5fe03443b89c9599fa14a2e422cade8547f155367b2' 
  AND token = 'ocn4efkfzkL1MO2xjsfe/2HU97Stg5sDP8lP2v9Bu0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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