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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '842de2e7caf275634aff95f1545b05523db975c7384f691405e06c91526e1748' 
  AND token = 'TaXCG7xsfKtPKNStMAg7OL4Idr3cPBih0WYkuCJFMgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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