SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86d84fec5b364163447ae9de6adb134b36b14cd4669105746df7a9a2385daa7b' 
  AND token = 'OKB+0Ygxy4ZlJmF3vu29wCX4+tbW9XsFT69fRC/i3YY=' 
  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