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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7beafc22def01bcdb726ea98a10debce4275a0510b9ed40a46db3c35702fab9' 
  AND token = 'Gaqdtqj0OMubCOE7+QXXtmTVrNZVboNjcx6Ai7Va+dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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