SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa5c701cd706186bf0428c225577b38d895cd5f3b90638a6d4b2936a5fcd5917' 
  AND token = 'Rd2L5m/qvKut2t8OZyYrj6Dxv7Dbkd4Ijv6G5b3TLaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

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