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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28cbc0f61d4c32b441927ee57ddaa7750892d8122482f5aae23baf2884707214' 
  AND token = 'XhuxJw7O6qhTdlpFU7s6qVN22ef+TN75eV3OjncQ21E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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