SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f19027883d5391d5826ec0ae2b2804526cca205f4af9427cb9d309729f30c8' 
  AND token = 'DIjbg//hbrz9DfZH4gUYIWPS6pNNcaDJ9hq3ajpxoQo=' 
  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