SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19f8a02099f0982c4997bb66bf4eb392dd71543ef3a362bd19d2ac7d8cde019' 
  AND token = 'VD2hrS1Z3h7POIQ8xOjYvjfPw/vUEk3UPOYHweGbalI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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