SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b90d703f7cbf8463eaf56ed9f88368193cf3fe91964a01401a5545f6589a1bb' 
  AND token = 'hxZnqKyQH01DiJWtLjqbXJEMjYEEbJKY7ZQ+HnzhTV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

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