SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd366d48db5d7937ca901ab74c4e70cd5c9e01e15e83de0b5159bc65e2c6b1496' 
  AND token = '+o+0de4lbPLNqzPGKqPsTXuPwC9UuYxwr/kc2WMGW/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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