SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8464b6c72b7e1af1ae969aeaf84d18856dcc7ac7a11f27da3885ae6b492e92d' 
  AND token = 'B71lVudbV8u+i/us50nvoW1Q7EOGefmOmX20hmQCglw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

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