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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eba065995d7c6f75c3ff1e9a07914450c59921bbb2910ad0570440c0ecd31c7' 
  AND token = 'Vah6Y4F/XdVAd9ZndxlRucRzUJ2z77VT1hHH/gbCj5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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