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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c48208cf8ed51a18b4b899c760f02be8c338b4cd740af899f430e9b40f469f61' 
  AND token = '8HV9MHsuKdVP8RALDsgyXrUMhjhCONaoUf02iEK2HXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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