SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ae4f8be55f397c398b6b01f9e66d686676aa999875c17a73366f4a54c9cc697' 
  AND token = 'A8bDFgqhcKclqsuTUQdW0ScPUX6vh+rrE7nIDZX6AN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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