SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e55772852774d9ee94e908f1a1deada758773b9a3fc35b26e47b96993666a93' 
  AND token = 'ZUcDnK9lK/+o7cE5mB7BNWYSffdQoWF93aa5nvg/5H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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