SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52e8ba6398f46445646c14a783a32dd07cf911cd4e3546a58f24227aa133bea1' 
  AND token = 'S5qYGeKXobqNkvnQBmFsYwULXS6keHue0AY+5LLe4lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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