SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60f704e5ec2fa36c2265d357bc94d37d27118ce4ca8cd86429de32ee4bd3e50' 
  AND token = '/04/bwp8hFrxKTt4QPDsbRhnjrScJWumKkYzfrE0Oqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

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