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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8da3726a7afebd9174359bd12ed3828b6760a9a7537faffc12870e63404079df' 
  AND token = 'd7P5BHD25V8Tf0pa+A8W3YJ42wxeldmPPUICoVBJw48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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