SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f154aa120b6d7493300d9f3dbc1d682689afca3326758f775c0ecdf38f86ddd5' 
  AND token = 'uYqU4flacibnmOPStgM+MTTTQzfYP+n+2GLD5lF2GIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

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