SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec047b0ed5ab9d400144e4a78144bc39077ba786bf4d63e26202ed65584a3c7' 
  AND token = 's8SoNA7b+yQXpJoH2am8RQZNtfUNoTh7RdCv5yh2vi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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