SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd0bdc04e81c25acd34819f809f2ae62448040702f3e0e0bf35d761feeb29b9d' 
  AND token = 'N5fJNUWHm+jlbmsX9OX+b0tikkvfrZY+BG/I+vh7Zqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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