SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af4ea78512e64e45be129e6953698d6d1c29efca1f2b4cc2df2950f18d17e3c3' 
  AND token = 'rfwO/wz59rMBDXJKWY40P9j+t9fA0dejJjIa1hdBoTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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