SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24ac72c6bb5eacf04bf2a353bf8514dd30dd9664d938a3c4406d217d3803d9e3' 
  AND token = 'dzWCel5nsm+Yg37RAfCRywm0LyPlQXFviL4/cCtUq9k=' 
  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