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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6191b27654f9461bf13684542b03bd863d8e99b355debaff0464258c27e9082' 
  AND token = 'LhToRCALn89MDzhXDzyjbwV1FL7fc8gIi10EPI9yF/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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