SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '438fdd5a3750849b296f5927ba4fba9a23d8fe5b27ab776bfa252f14a9f3d061' 
  AND token = 'Cai8YAOgBL4ZikUVvg829js/lQhKmxSa5wkkS7xY1l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

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