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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c28b6bc70269931ad50df8429f5c15cb8a79e8532711a2aae9ef0666c0c909' 
  AND token = 'ClImyG0BkdDvBk1ht5sTUnhQgd/CjEqv+3iM9zdHivc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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