SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fbe8204195f67d57180622f32ae05664345219e2c1c85810ecbb86bdb179fbe' 
  AND token = 'WZX8JFmjaML1lpIVcowWOWW0ZKLCOgVX3wXviGrXDhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}