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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6567fa26237bd596f64e6cf723dc59adf2f1f5811f7ee6198c3ddbcd51ae33e6' 
  AND token = 'mB6TgP8HSiIb4JxVHOwc8vUay9LS5zj3LldKJEK5Oiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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