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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc02afe123d42f3d65cd7d89ab0dc7c0d5d8dd3717c90055ae985a00f007d63b' 
  AND token = 'Ho2LJWpkdVn48hZ56d6c/DwLoUhOycGDzI9gUHYFe9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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