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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '843e848a61b754739a4998d61876566b6558233cfa107a8aa57be86924670dc2' 
  AND token = 'svPxXXW84CMzuOkBkhJCTcJ2kGWXH5QEIcg9lc2+An0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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