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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '340c9a69a59c37861c2ddc8579e7daea64117f63491260472f5ed8397c33781e' 
  AND token = 'MjDqYGNi5BDAEDXY8ef6kuerMOn+CiE7pvu2soD9nMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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