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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50ad9108c790bbd3bbc64a9e3eb0f0530472d51aeb8cf6d7d73e20c52a61e95d' 
  AND token = 'HGvRdDroyKTJE/nN16RGlOy5zSQwJL2xSM+teYgJI/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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