SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d26fc45b95ede1d41d1c2843015b072f04813b14247a47481302b6d179230dc' 
  AND token = '5UsKi9CJEskPfW6g8xZ/rCuCitn4m58hk3pQBYwG9V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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