SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6afa2767cdbb815698bd99a961356ae245ff3ec1ddc8474f7a013abef24f7b81' 
  AND token = 'En6dOiZLFmTK9R0V+FuTZccU10uqSRFAB4YPSYvfqnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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