SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0f19f256b49d1c6f28bd477b460c4f81d59a127f44e48353683de664c1c20d' 
  AND token = 'vaZfS27uVYYCBPV/tFOx6F4pgjNbjeQ8By6UjlJ/fyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

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