SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a375581db8e8b2bec1d8fbdbde75fbcf2bb48e6a39e65a32ac44620842e1334' 
  AND token = 'EE0+hEYWn3LNgbQf0TV1FJxOZbK+6LnI0aehGt77/nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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