SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f074cc6505cfe88fa7d8079738526b3b2d33a3d68c53ba455d9b3efb780597' 
  AND token = 'V5aCcTEiIjNMvhYkwvROScdE7z8Bb/ol8YGbPv5H1Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

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