SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d252dcd0a6bfcc977fa306f402e155a9f5323577a29de528a31d6d81a32ddf' 
  AND token = '1eVj3WIbThtIhpKYllm4EPG3l7YzuqGST69EoZZWLbY=' 
  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