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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03e878f86a437b571e4c67711eb61429b81bc822cd6d2b8d830cc4c51feaf095' 
  AND token = 'y2BQ4R0YJntajAktl92WxOx3Pt5KFkb7cwk9SmQcozU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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