SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0fb8917bc4e714f7084952c25f882fee8f1ae3fa4ffefc616d87efe82c66599' 
  AND token = '1Rbxq+eRyCqglQ6Y48HrBbbJ1rLyD6EEv/c5JNUW1HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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