SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a97df5617faba3cfe64d01ec9078e80e4ba2933e2ba15820aebd31375fad1fb' 
  AND token = 'ylQQgeqzKTPetFaMxgOyNI/S3t8D+wiKXLYxJKAsQyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

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