SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07e0b3e93477fbc73e319331ac3a91ba0f3300ae4bf9f4193019348bc60b5be0' 
  AND token = 'EmTn4LYmlb02+SpXsgKkG1Xm9w2AX6vTwNCvS4/O98I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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