SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fb52d365d6aa9dd5feef8b9bf2f5a259c6057d109cd61c4191fec3b2feb27b4' 
  AND token = '5OO/VM5ytge70xTytieApTFjNAQ6Jqx/BaaaNBdCtig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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