SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e0e1c72d1d016dad10aa021d3ad375ce8cc2c01fa698cb043bfb923a259d3f5' 
  AND token = 'OnAVeNwlM6Oj4OUSZeOa/zXV0BqoEEYfKSQU4449zPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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