SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e647e8f12344def559d30d54d739e80af4cf09e69d553429c255cc8f642ae238' 
  AND token = 'PipAKQAP23KvuFlLyBiWyyPDZBUNY6nYf+duZ4erIrk=' 
  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