SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '276e0b71198b28dcdf2165567745adafc29e51fa8bf92c7dcbfd7312207663ef' 
  AND token = 'kV2NwFiZ0owhIogX3Qu3BDhiB53jufQgW+2YzKuqmX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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